[2024 Update] The typical range for tankless heater installation is between $5,400 and $7,400, averaging out to around $6,400 (including the water heater, warranty and tune ups). The tankless heater installation without the unit can cost between $1800 and $3500, averaging out to around $2650. *Prices vary based on the complexity of the circumstances. Few … Continue reading Tankless Water Heater Installation Cost (2024)